How to set or enforce TLS 1.3 version?

[MansoorZ]

I am trying to set my TLS version as 1.3 but unfortunately I am not able to do that.
Could you please help me to where I can set my TLS version in the code?

Before my server configuration was TLSv1.2 , in this I can connect the web-socket without any issue.
After my server TLS version has been changed to TLSv1.3, now I am not able to connect the web-socket by using this SR Library.

Printing description of error:
Error Domain=NSOSStatusErrorDomain Code=-9836 "(null)" UserInfo={_kCFStreamErrorCodeKey=-9836, _kCFStreamErrorDomainKey=3}

It would be very helpful If I get the solution ASAP. Thanks in advance for your support.

FYI,
Using Xcode 15.1, ios 17.1,

Thanks
Mansoor